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Title: Population dose due to natural radiation in Hong Kong

Abstract

In densely populated cities such as Hong Kong where people live and work in high-rise buildings that are all built with concrete, the indoor gamma dose rate and indoor radon concentration are not wide ranging. Indoor gamma dose rates (including cosmic rays) follow a normal distribution with an arithmetic mean of 0.22 {+-} 0.04 {micro}Gy h{sup {minus}1}, whereas indoor radon concentrations follow a log-normal distribution with geometric means of 48 {+-} 1 Bq m{sup {minus}3} and 90 {+-} 2 Bq m{sup {minus}3} for the two main categories of buildings: residential and non-residential. Since different occupations result in different occupancy in different categories of buildings, the annual total dose [indoor and outdoor radon effective dose + indoor and outdoor gamma absorbed dose (including cosmic ray)] to the population in Hong Kong was estimated based on the number of people for each occupation; the occupancy of each occupation; indoor radon concentration distribution and indoor gamma dose rate distribution for each category of buildings; outdoor radon concentration and gamma dose rate; and indoor and outdoor cosmic ray dose rates. The result shows that the annual doses for every occupation follow a log-normal distribution. This is expected since the total dose is dominated bymore » radon effective dose, which has a log-normal distribution. The annual dose to the population of Hong Kong is characterized by a log-normal distribution with a geometric mean of 2.4 mSv and a geometric standard deviation of 1.3 mSv.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Hong Kong (HK)
OSTI Identifier:
20075784
Resource Type:
Journal Article
Journal Name:
Health Physics
Additional Journal Information:
Journal Volume: 78; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0017-9078
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 61 RADIATION PROTECTION AND DOSIMETRY; HONG KONG; INDOOR AIR CONTAMINATION; RADON; RADIATION DOSES; NATURAL RADIOACTIVITY; RADIATION MONITORING; BUILDINGS

Citation Formats

Tso, M.Y.W., and Leung, J.K.C. Population dose due to natural radiation in Hong Kong. United States: N. p., 2000. Web. doi:10.1097/00004032-200005000-00013.
Tso, M.Y.W., & Leung, J.K.C. Population dose due to natural radiation in Hong Kong. United States. doi:10.1097/00004032-200005000-00013.
Tso, M.Y.W., and Leung, J.K.C. Mon . "Population dose due to natural radiation in Hong Kong". United States. doi:10.1097/00004032-200005000-00013.
@article{osti_20075784,
title = {Population dose due to natural radiation in Hong Kong},
author = {Tso, M.Y.W. and Leung, J.K.C.},
abstractNote = {In densely populated cities such as Hong Kong where people live and work in high-rise buildings that are all built with concrete, the indoor gamma dose rate and indoor radon concentration are not wide ranging. Indoor gamma dose rates (including cosmic rays) follow a normal distribution with an arithmetic mean of 0.22 {+-} 0.04 {micro}Gy h{sup {minus}1}, whereas indoor radon concentrations follow a log-normal distribution with geometric means of 48 {+-} 1 Bq m{sup {minus}3} and 90 {+-} 2 Bq m{sup {minus}3} for the two main categories of buildings: residential and non-residential. Since different occupations result in different occupancy in different categories of buildings, the annual total dose [indoor and outdoor radon effective dose + indoor and outdoor gamma absorbed dose (including cosmic ray)] to the population in Hong Kong was estimated based on the number of people for each occupation; the occupancy of each occupation; indoor radon concentration distribution and indoor gamma dose rate distribution for each category of buildings; outdoor radon concentration and gamma dose rate; and indoor and outdoor cosmic ray dose rates. The result shows that the annual doses for every occupation follow a log-normal distribution. This is expected since the total dose is dominated by radon effective dose, which has a log-normal distribution. The annual dose to the population of Hong Kong is characterized by a log-normal distribution with a geometric mean of 2.4 mSv and a geometric standard deviation of 1.3 mSv.},
doi = {10.1097/00004032-200005000-00013},
journal = {Health Physics},
issn = {0017-9078},
number = 5,
volume = 78,
place = {United States},
year = {2000},
month = {5}
}